Special needs

Fish species most affected by William Jess Dam/Lost Creek Reservoir. Significant amount of high-quality habitat blocked. Water quality below dam problematic. Corps of Engineers, especially outside of flood control operations, must operate in way that protects spring Chinook to meet its fishery enhancement objective.

Limiting factors

Water quality (changes in flow and temperature that result from reservoir operation). Fish passage (limited amount of spawning habitat). Fishery impacts. Marine survival.

Data gaps

Development and implementation of water temperature model for Lost Creek Reservoir; ongoing monitoring of gravel quantity and quality below Lost Creek, and restoration of gravel as needed (USACE). Update knowledge of fall Chinook spawning distribution upstream within remaining spring Chinook spawning habitat.